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Q: engine has no spark or gas on 2004 Chevrolet Aveo

i just recently installed a rebuilt crate motor into a 2004 aveo the new motor came with a wiring harness so i put the motor in with the harness and got no spark so i checked all the connection and they were fine and i noticed when i turned the key on i could not here the fuel pump so then i took the whole harness off and installed the old one and still no spark or gas but the motor turns over and the engine fuse panel has power and there were no chafes to the harness so theres n short and i bypassed the fuel pump and it worked but the funny thing is that some of the display lights stay on even when the key is off so im woundering is there a code you have to enter to regain power to the vitals for the motor or the only other thing is could it be the brain that sits next to the fuse box in the engine compartment and note i am doing this for a friend because the old moltor ran dry then seized so i dont know what they could have done to try to start it only reason i ask about the the code is because i used to work at a car stereo store and some chevys had vital wiring that ran through the radio so to have a aftermarket radio you would have to have a module for all those the connections for things to work the reason i say this is cause when u turn the car to on then try to turn the radio on i says to enter a code much thanks to anyone who can help...oh yes and how might i test the brain or could a dealer test it
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oooo you should not have done that at all. That kind of wiring should have been done by a mechanic who knows your make and model of your car, or your dealership would know. What you did, can be reversed back, but it will cost you into the thousands of dollars to get that reversed.

Please take your car to your dealership immediately. If you can't do that, then have it towed there. What you did to the car's wiring, will cost you a lot of money.

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